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Analysis of OSNR Requirements for Higher Modulation Schemes for Various Local Oscillator Powers

Sahu, Amaresh Kumar (2015) Analysis of OSNR Requirements for Higher Modulation Schemes for Various Local Oscillator Powers. In: International Conference on Optics and Photonics (ICOP), FEB 20-22, 2015, Kolkata, INDIA.

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Official URL: http://dx.doi.org/10.1117/12.2182809


To meet the growing demands of data traffic in long haul communication, it is necessary to efficiently use the low-loss region(C-band) of the optical spectrum, by increasing the no. of optical channels and increasing the bit rate on each channel But narrow pulses occupy higher spectral bandwidth. To circumvent this problem, higher order modulation schemes such as QPSK and QAM can be used to modulate the bits, which increases the spectral efficiency without demanding any extra spectral bandwidth. On the receiver side, to meet a satisfy, a given BER, the received optical signal requires to have minimum OSNR. In our study in this paper, we analyses for different modulation schemes, the OSNR required with and without preamplifier. The theoretical limit of OSNR requirement for a modulation scheme is compared for a given link length by varying the local oscillator (LO) power. Our analysis shows that as we increase the local oscillator (LO) power, the OSNR requirement decreases for a given BER. Also a combination of preamplifier and local oscillator (LO) gives the OSNR closest to theoretical limit.

Item Type: Conference Proceedings
Series.: Proceedings of SPIE
Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: Coherent detector; Direct Detector; Optical Transmitter; Local Oscillator; Modulation; OSNR; DSP Processing; Symbol error Probability
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 11 Aug 2015 09:45
Last Modified: 11 Aug 2015 09:45
URI: http://eprints.iisc.ac.in/id/eprint/52087

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